* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    padding-top: 60px;
    background-color: #f8f9fa;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 50px;
    background-color: #333;
    color: white;
    display: flex;
    align-items: center;
    padding: 0 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    z-index: 1000;
    justify-content: space-between;
}

.logo {
    font-size: 1.5em;
    font-weight: bold;
    margin-right: 20px;
}

.users {
    display: flex;
    align-items: center;
}
.users p{
    padding-right: 10px;
    align-content: center;
    font-family: Arial, Helvetica, sans-serif;
}

.nav-links {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links li { 
    margin-right: 15px;
    list-style: none;
}

.nav-links a {
    color: white;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-links a:hover {
    background-color: rgb(24, 15, 15);
}

.content {
    padding: 20px;
    height: 2000px;
}

.user-btn {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
    font-size: 1em;
}

user-btn:hover {
    background-color: #2980b9;
}
@media (max-width: 480px) {
    .nav-links li:not(:last-child) {
        display: none; /* 小屏幕上只显示登录按钮 */
    }
    
    .error-code {
        font-size: 60px;
    }
    
    .action-buttons {
        flex-direction: column;
        gap: 12px;
    }
    
    .btn {
        width: 100%;
    }
}